The stability I have in mind is the durability of time--is this service something that will stick around, or if it dies, do all of the links posted everywhere go with it? If the site is down, do all of the links break until they're back up again?. It looks nifty, but it's just as easy in many cases to cut and paste and make hot links that don't take up much space for the person who just clicks on the link.

SRS